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Quote:
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Roosevelt signed an unpublished (secret) executive order in May 1940 allowing U.S. military personnel to resign from the service so that they could participate in a covert operation in China: the American Volunteer Group, also known as Chennault's Flying Tigers. Over a seven-month period, Chennault's Flying Tigers destroyed an estimated 600 Japanese aircraft, sunk numerous Japanese ships, and stalled the Japanese invasion of Burma.
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source:
http://en.wikipedia.org/wiki/World_War_II
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